Bump @fortawesome/fontawesome-free from 6.4.2 to 6.5.1

Bumps [@fortawesome/fontawesome-free](https://github.com/FortAwesome/Font-Awesome) from 6.4.2 to 6.5.1.
- [Release notes](https://github.com/FortAwesome/Font-Awesome/releases)
- [Changelog](https://github.com/FortAwesome/Font-Awesome/blob/6.x/CHANGELOG.md)
- [Commits](FortAwesome/Font-Awesome@6.4.2...6.5.1)

---
updated-dependencies:
- dependency-name: "@fortawesome/fontawesome-free"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -6,7 +6,7 @@
     "doc": "doc"
   },
   "dependencies": {
-    "@fortawesome/fontawesome-free": "6.4.2"
+    "@fortawesome/fontawesome-free": "6.5.1"
   },
   "devDependencies": {
     "remark-cli": "12.0.0",